锯齿自旋链系统Fe $_2$ O（SeO PDMATHAAC）$_2$的平带自旋动力学和声子反常
Flat-band spin dynamics and phonon anomalies of the saw-tooth spin-chain system Fe$_2$O(SeO$_3$)$_2$
摘要：
Fe $^{3+}$ $S = 5/2$离子沿含氧亚硒酸盐Fe $_2$ O（SeO $_3$）$_2$的$a$轴形成锯齿状链，并在低于$T_C = 105$ K的温度下观察到长程磁序的开始。这种顺序导致不同的指纹声子模式的线宽和能量，通过拉曼散射解决。此外，在低于$T = 150$ K的温度下，出现了新的小线宽激发，并将其归因于平带和高能磁振子分支参与的双磁振子散射过程。从这一组交换耦合常数估计。锯齿形脊-脊和脊-顶点相互作用的特定比率可以解释二聚体量子基态对不相称的3D磁序的不稳定性。
英文摘要：
Fe$^{3+}$ $S = 5/2$ ions form saw-tooth like chains along the $a$ axis of the oxo-selenite Fe$_2$O(SeO$_3$)$_2$ and an onset of long-range magnetic order is observed for temperatures below $T_C = 105$ K. This order leads to distinct fingerprints in phonon mode linewidths and energies as resolved by Raman scattering. In addition, new excitations with small linewidths emerge below $T = 150$ K, and are assigned to two-magnon scattering processes with the participation of flat-band and high energy magnon branches. From this a set of exchange coupling constants is estimated. The specific ratio of the saw-tooth spine-spine and spine-vertex interactions may explain the instability of the dimer quantum ground state against an incommensurate 3D magnetic order.
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